#include <cstdio>

using namespace std;

int main() {
    double a, b, c;
 
    scanf("%lf%lf%lf", &a, &b, &c);
    printf("MEDIA = %.1lf\n", a * 0.2 + b * 0.3 + c * 0.5);
    
    return 0;
}
